Grilled Patty Melt (Print Version)

# Ingredients:

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01 - 6 slices of thick rye bread
02 - 6 ounces of swiss cheese, shredded
03 - 1 pound of ground chuck, 80/20 blend
04 - 3 teaspoons of avocado oil
05 - 2 teaspoons of apple cider vinegar
06 - 2 large yellow onions, sliced thin
07 - 5 tablespoons of unsalted butter

# Instructions:

01 - Let the onions slowly cook in melted butter over medium heat for 5 minutes with a lid on, then lower the heat, stirring now and then for half an hour, or until they're deeply golden. Finish with vinegar to scrape up the tasty bits.
02 - Divide the beef into three and shape into patties. Don't season them too soon; wait until right before cooking. Get the griddle to a hot 375–400°F.
03 - Sear the patties in avocado oil for about 3 minutes per side until browned.
04 - Spread butter on each side of the rye bread slices. Pop them on the hot griddle and toasty them up for 1 to 2 minutes on each side.
05 - Stack the cheese, caramelized onions, and a burger patty on a piece of toasted bread. Cap it off with another slice and enjoy!

# Notes:

01 - Each part can be prepared 2 days ahead as long as they're stored separately.
02 - Assembled sandwiches can hang out in the fridge for 3 days.
03 - Freezing isn't recommended for this one.